In one example, a photo cassette for a mobile printer includes a support surface to support a stack of photo media sheets, a cover to at least partially cover the stack of photo media sheets, and a window formed in the cover to receive a pinch mechanism of the mobile printer through the window to provide a normal force to the stack of photo media sheets.

A sheet transport apparatus includes a first casing in which a transport path is formed; a transport unit which transports a sheet along the transport path; a second casing which is provided to be movable with respect to the first casing; a sheet support unit which is rotatably provided in the first casing at a position on a side to which the second casing is moved, the sheet support unit being changeable between a first state, a second state, and a third state and supporting the sheet at least in the third state; and an urging unit which urges the sheet support unit toward the first state within a range from the first state to the second state and which urges the sheet support unit toward the third state within a range from the second state to the third state.

A medium storage box includes an internal storage space configured to store a paper sheet-shaped medium. The medium storage box includes: a first opening into which an insertion member is inserted from outside; a second opening through which the medium passes; a first shutter member that closes off the first opening; a second shutter member that closes off the second opening; and a biasing mechanism that biases either the first shutter member, or the second shutter member, or both, in a closing direction. The first shutter member is configured to be pressed by the insertion member and moves in an opening direction during insertion of the insertion member, such that a portion of the first shutter member abuts the second shutter member and moves the second shutter member in an opening direction.

A sheet transport apparatus includes a first casing in which a transport path is formed; a transport unit which transports a sheet along the transport path; a second casing which is provided to be movable with respect to the first casing; a sheet support unit which is rotatably provided in the first casing at a position on a side to which the second casing is moved, the sheet support unit being changeable between a first state, a second state, and a third state and supporting the sheet at least in the third state; and an urging unit which urges the sheet support unit toward the first state within a range from the first state to the second state and which urges the sheet support unit toward the third state within a range from the second state to the third state.

A sheet transport apparatus includes a first casing in which a transport path is formed; a transport unit which transports a sheet along the transport path; a second casing which is provided to be movable with respect to the first casing; a sheet support unit which is rotatably provided in the first casing at a position on a side to which the second casing is moved, the sheet support unit being changeable between a first state, a second state, and a third state and supporting the sheet at least in the third state; and an urging unit which urges the sheet support unit toward the first state within a range from the first state to the second state and which urges the sheet support unit toward the third state within a range from the second state to the third state.

A second right-side extension portion entirely overlaps with a first right-side extension portion in a stored state when viewed in a depth direction, and a second left-side extension portion entirely overlaps a first left-side extension portion in a stored state when viewed in the depth direction. Moreover, a right-side gear is provided so as to be located between a right-side first end portion and a right-side second end portion of the first right-side extension portion, and a left-side gear is provided so as to be located between a left-side first end portion and a left-side second end portion of the first left-side extension portion.

A medium conveying apparatus includes a first media tray including a first media placement surface, a second media tray located above the first media tray and having a second media placement surface, and a third media tray located above the second media tray and having a third media placement surface. A width of the second media placement surface in an intersecting direction intersecting a medium conveying direction and a width of the third media placement surface in the intersecting direction are smaller than a width of the first media placement surface in the intersecting direction, and the third media tray is swingable relative to the second media tray in accordance with an amount of media placed on the second media placement surface.